Every basketball system manufacturer on the planet wants to 1, have you buy their product; and 2, buy their replacement parts for their product. Thus, Lifetime Products, Spalding, Huffy, Goalrilla, Goalsetter, Mammoth, and every other maker you can think of has their very own design and specification for their rims. Not only that, these manufacturers also have various forms of rims inside their product line as well that are, you guessed it, not always compatible.